diff options
Diffstat (limited to 'drivers/soc/microchip/mpfs-sys-controller.c')
| -rw-r--r-- | drivers/soc/microchip/mpfs-sys-controller.c | 56 |
1 files changed, 38 insertions, 18 deletions
diff --git a/drivers/soc/microchip/mpfs-sys-controller.c b/drivers/soc/microchip/mpfs-sys-controller.c index 6e20207b5756..216d9f4ea0ce 100644 --- a/drivers/soc/microchip/mpfs-sys-controller.c +++ b/drivers/soc/microchip/mpfs-sys-controller.c @@ -11,12 +11,19 @@ #include <linux/slab.h> #include <linux/kref.h> #include <linux/module.h> +#include <linux/jiffies.h> #include <linux/interrupt.h> #include <linux/of_platform.h> #include <linux/mailbox_client.h> #include <linux/platform_device.h> #include <soc/microchip/mpfs.h> +/* + * This timeout must be long, as some services (example: image authentication) + * take significant time to complete + */ +#define MPFS_SYS_CTRL_TIMEOUT_MS 30000 + static DEFINE_MUTEX(transaction_lock); struct mpfs_sys_controller { @@ -28,35 +35,47 @@ struct mpfs_sys_controller { int mpfs_blocking_transaction(struct mpfs_sys_controller *sys_controller, struct mpfs_mss_msg *msg) { - int ret, err; + unsigned long timeout = msecs_to_jiffies(MPFS_SYS_CTRL_TIMEOUT_MS); + int ret; - err = mutex_lock_interruptible(&transaction_lock); - if (err) - return err; + ret = mutex_lock_interruptible(&transaction_lock); + if (ret) + return ret; reinit_completion(&sys_controller->c); ret = mbox_send_message(sys_controller->chan, msg); - if (ret >= 0) { - if (wait_for_completion_timeout(&sys_controller->c, HZ)) { - ret = 0; - } else { - ret = -ETIMEDOUT; - dev_warn(sys_controller->client.dev, - "MPFS sys controller transaction timeout\n"); - } + if (ret < 0) { + dev_warn(sys_controller->client.dev, "MPFS sys controller service timeout\n"); + goto out; + } + + /* + * Unfortunately, the system controller will only deliver an interrupt + * if a service succeeds. mbox_send_message() will block until the busy + * flag is gone. If the busy flag is gone but no interrupt has arrived + * to trigger the rx callback then the service can be deemed to have + * failed. + * The caller can then interrogate msg::response::resp_status to + * determine the cause of the failure. + * mbox_send_message() returns positive integers in the success path, so + * ret needs to be cleared if we do get an interrupt. + */ + if (!wait_for_completion_timeout(&sys_controller->c, timeout)) { + ret = -EBADMSG; + dev_warn(sys_controller->client.dev, "MPFS sys controller service failed\n"); } else { - dev_err(sys_controller->client.dev, - "mpfs sys controller transaction returned %d\n", ret); + ret = 0; } +out: mutex_unlock(&transaction_lock); return ret; } EXPORT_SYMBOL(mpfs_blocking_transaction); -static void rx_callback(struct mbox_client *client, void *msg) +static void mpfs_sys_controller_rx_callback(struct mbox_client *client, void *msg) { struct mpfs_sys_controller *sys_controller = container_of(client, struct mpfs_sys_controller, client); @@ -66,8 +85,8 @@ static void rx_callback(struct mbox_client *client, void *msg) static void mpfs_sys_controller_delete(struct kref *kref) { - struct mpfs_sys_controller *sys_controller = container_of(kref, struct mpfs_sys_controller, - consumers); + struct mpfs_sys_controller *sys_controller = + container_of(kref, struct mpfs_sys_controller, consumers); mbox_free_channel(sys_controller->chan); kfree(sys_controller); @@ -102,8 +121,9 @@ static int mpfs_sys_controller_probe(struct platform_device *pdev) return -ENOMEM; sys_controller->client.dev = dev; - sys_controller->client.rx_callback = rx_callback; + sys_controller->client.rx_callback = mpfs_sys_controller_rx_callback; sys_controller->client.tx_block = 1U; + sys_controller->client.tx_tout = msecs_to_jiffies(MPFS_SYS_CTRL_TIMEOUT_MS); sys_controller->chan = mbox_request_channel(&sys_controller->client, 0); if (IS_ERR(sys_controller->chan)) { |